Elastic Stack：es JavaApi搜索入门

Posted 2020-12-10 秋风飒飒吹

一.入门API

@SpringBootTest(classes = SearchApplication.class)
@RunWith(SpringRunner.class)
public class TestSearch {
    @Qualifier("restHighLevelClient")
    @Autowired
    RestHighLevelClient client;

    @Test
    public void testSearchAll() throws IOException {
        //构建搜索请求
        SearchRequest request = new SearchRequest("book");
        //构建搜索请求体
        SearchSourceBuilder builder = new SearchSourceBuilder();
        builder.query(QueryBuilders.matchAllQuery());
        //第一个参数：包含哪些字段  第二个参数：排除哪些字段
        builder.fetchSource(new String[]{},new String[]{"pic","timestamp"});
        request.source(builder);
        //执行搜索请求
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        //获取结果
        SearchHits hits = response.getHits();
        SearchHit[] hits1 = hits.getHits();
        Arrays.asList(hits1).forEach(hit->{
            System.out.println(hit.getId());
            System.out.println(hit.getScore());
            Map<String, Object> map = hit.getSourceAsMap();
            map.forEach((x,y)-> System.out.println(x+":"+y));
            System.out.println("==========");
        });
    }
}

 二.常用方法

分页：

builder.from(0);
builder.size(2);

 ids查询：

builder.query(QueryBuilders.idsQuery().addIds("1","3","5"));

match搜索：

builder.query(QueryBuilders.matchQuery("name","java编程"));

multi_match搜索：

第一个参数：查询的关键字

后面的参数：查询的字段

builder.query(QueryBuilders.multiMatchQuery("java","name","description"));

三.bool query查询 　

    @Test
    public void testSearchBool() throws IOException {
        //构建搜索请求
        SearchRequest request = new SearchRequest("book");
        //构建搜索请求体
        SearchSourceBuilder builder = new SearchSourceBuilder();
        //构建bool
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        boolQueryBuilder.must(QueryBuilders.matchQuery("description","java"));
        boolQueryBuilder.should(QueryBuilders.matchQuery("name","开发"));

        builder.query(boolQueryBuilder);
        //第一个参数：包含哪些字段  第二个参数：排除哪些字段
        builder.fetchSource(new String[]{},new String[]{"pic","timestamp"});
        request.source(builder);
        //执行搜索请求
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        //获取结果
        SearchHits hits = response.getHits();
        SearchHit[] hits1 = hits.getHits();
        Arrays.asList(hits1).forEach(hit->{
            System.out.println(hit.getId());
            System.out.println(hit.getScore());
            Map<String, Object> map = hit.getSourceAsMap();
            map.forEach((x,y)-> System.out.println(x+":"+y));
            System.out.println("==========");
        });
    }

　filter:

boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").gte("50").lte("90"));

 四.sort排序

　按照价格降序

    @Test
    public void testSearchSort() throws IOException {
        //构建搜索请求
        SearchRequest request = new SearchRequest("book");
        //构建搜索请求体
        SearchSourceBuilder builder = new SearchSourceBuilder();
        builder.query(QueryBuilders.matchAllQuery());
        //第一个参数：包含哪些字段  第二个参数：排除哪些字段
        builder.fetchSource(new String[]{},new String[]{"pic","timestamp"});
        //排序
        builder.sort("price", SortOrder.DESC);
        request.source(builder);
        //执行搜索请求
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        //获取结果
        SearchHits hits = response.getHits();
        SearchHit[] hits1 = hits.getHits();
        Arrays.asList(hits1).forEach(hit->{
            System.out.println(hit.getId());
            System.out.println(hit.getScore());
            Map<String, Object> map = hit.getSourceAsMap();
            map.forEach((x,y)-> System.out.println(x+":"+y));
            System.out.println("==========");
        });
    }